Push notifications are delayed while in Android doze mode

[Michael Leung]

I am putting my Android device into idle/doze mode by entering the following commands:

adb shell dumpsys battery unplug

adb shell dumpsys deviceidle step <-- repeat until state is IDLE

Then I send the following JSON to FCM:

{
    "to":"dufw ... Yd6",
    "priority": "high",
    "data":{
        "test0":"test0",
        "test1":"test1"

    }
}

The result: Nothing... until I wake up the device, then I would get the message. I am logging whatever is coming in my subclass of FirebaseMessagingService's "onMessageReceived()" method.

I am using

Device: Samsung Galaxy S7

Android Studio: v2.1.2

FCM SDK: com.google.firebase:firebase-messaging:9.4.0

I already googled around. Some people suggest using a older IDE version and upgrading the FCM SDK version (I had it at 9.0.0 before). I haven't had any success so far. Any help would be greatly appreciated.